Rails 4 rendering partials (undefined local variable or method)

Question

I am trying to pass two local variables to my partial but I am getting this undefined local variable or method `row' for #<#:0x00000105d7f3b0> when using it in the partial.

Render

<%= f.fields_for :menu_items do |builder| %>
<%= render partial: 'menu_item_fields', locals: {f: builder, row: f.options[:child_index]} %>
<% end %>`

Partial

<a href="#" data-target="item-<%= f.options[:child_index].to_s + "-" + row.to_s %>" class="item-field"><%= f.object.title %></a>

I am using nested attributes and need a builder for the nested items — dgolman
– dgolman, Commented Mar 17, 2014 at 17:32
Sorry, I just had a "duh" moment. I meant to say since :menu_items is a collection and you are rendering a partial each time rendering a collection may be better suited for this as it executes once for every item in the collection. — Travis Pessetto
– Travis Pessetto, Commented Mar 17, 2014 at 17:36
I will look into that but I still am stuck with the same problem — dgolman
– dgolman, Commented Mar 17, 2014 at 17:48

Ganesh Kunwar · Accepted Answer · 2014-03-17 16:45:13Z

1

Change this code

<a href="#" data-target="item-<%= f.options[:child_index].to_s + "-" + row.to_s %>" class="item-field"><%= f.object.title %></a>

as follows:

<a href="#" data-target="item-<%= f.options[:child_index].to_s + '-' + row.to_s %>" class="item-field"><%= f.object.title %></a>

answered Mar 17, 2014 at 16:45

Ganesh Kunwar

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1 Comment

dgolman Over a year ago

I tried that and I have tried just doing this <%= row %> and it still gives the same error. Great catch though.

rails4guides.com · Accepted Answer · 2014-03-17 17:17:08Z

0

I think it should be :

{ f: builder, row: builder.options[:child_index] }

Oops, I misread your code on my mobile phone. Does your code work correctly if you don't call it using a partial?

edited Mar 17, 2014 at 17:17

answered Mar 17, 2014 at 16:45

rails4guides.com

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4 Comments

dgolman Over a year ago

If that was the case I would have no reason to pass row in the first place.

rails4guides.com Over a year ago

Right, what happens if you only pass f along? Like: parent_form: f. And then in your partial call parent_form.options[:child_index] ?

dgolman Over a year ago

Same thing. It says undefined for the parent_form. The problem occurs when I have more than one local variable

rails4guides.com Over a year ago

Passing multiple values through locals should be no problem. You could test this by only passing parent_form and again call parent_form.options[:child_index]. It should still fail.

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